/* =============================================================
   website-upgrade.css —— 网站改版升级
   左文右对比卡首屏 + 6 信号 + 6 步流程 + 深色切换
   ============================================================= */

/* 1. 首屏 */
.wu-hero{
  padding:calc(var(--header-h) + var(--topbar-h) + 70px) 0 90px;
  background:
    linear-gradient(135deg, var(--paper) 0%, var(--paper-deep) 100%);
  overflow:hidden;
}
.wu-hero-inner{
  display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;
}
.wu-hero-kicker{font-size:12.5px;letter-spacing:.34em;color:var(--earth-deep);margin-bottom:22px}
.wu-hero-title{font-size:clamp(28px,4.2vw,48px);line-height:1.35;margin-bottom:22px}
.wu-hero-em{
  color:var(--earth-deep);
  border-bottom:3px solid var(--earth);
}
.wu-hero-sub{font-size:15.5px;color:var(--ink-soft);line-height:1.95;margin-bottom:28px;max-width:560px}
.wu-hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:16px}
.wu-hero-contact{font-size:13px;color:var(--ink-faint)}
.wu-hero-contact a{color:var(--ink);border-bottom:1px dashed var(--line-strong)}
.wu-hero-contact a:hover{color:var(--earth-deep)}

.wu-hero-visual{display:flex;justify-content:center}
.wu-vs{
  display:flex;align-items:center;gap:18px;
  background:var(--paper);border:1px solid var(--line-strong);
  padding:26px 22px;border-radius:var(--radius);box-shadow:var(--shadow);
}
.wu-vs-side{
  display:flex;flex-direction:column;gap:8px;
  font-size:13px;line-height:1.6;
}
.wu-vs-side p{color:var(--ink-soft)}
.wu-vs-tag{
  font-size:11px;letter-spacing:.2em;padding:3px 10px;
  align-self:flex-start;
}
.wu-vs--old .wu-vs-tag{background:var(--brown);color:#FBF7EF}
.wu-vs--new .wu-vs-tag{background:var(--earth);color:#FBF7EF}
.wu-vs--new p{color:var(--earth-deep);font-weight:600}
.wu-vs-arrow{font-size:24px;color:var(--earth)}

/* 2. 6 信号 */
.wu-when-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
}
.wu-when{
  background:var(--paper);border:1px solid var(--line);
  padding:26px 22px;transition:all .3s ease;
}
.wu-when:hover{border-color:var(--earth);transform:translateY(-3px)}
.wu-when h3{font-size:16.5px;margin-bottom:8px;color:var(--earth-deep)}
.wu-when p{font-size:13.5px;color:var(--ink-soft);line-height:1.85}

/* 3. 流程 */
.wu-process-section{background:var(--paper-deep)}
.wu-process{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:wustep;
}
.wu-step{
  background:var(--paper);padding:30px 24px;border-top:3px solid var(--earth);
}
.wu-step-no{
  font-family:var(--font-serif);font-size:36px;color:var(--brown-pale);
  display:block;margin-bottom:10px;line-height:1;
}
.wu-step h3{font-size:18px;margin-bottom:8px}
.wu-step p{font-size:13.5px;color:var(--ink-soft);line-height:1.85}

/* 4. 数据迁移 */
.wu-migrate-wrap{
  display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;
}
.wu-migrate-copy h2{margin-bottom:18px}
.wu-migrate-copy .lead{margin-bottom:22px}
.wu-migrate-list{display:flex;flex-direction:column;gap:12px}
.wu-migrate-list li{
  font-size:13.8px;color:var(--ink-soft);line-height:1.85;
  padding-left:18px;position:relative;
}
.wu-migrate-list li::before{
  content:"";position:absolute;left:0;top:11px;
  width:8px;height:2px;background:var(--earth);
}
.wu-migrate-list b{color:var(--ink);font-family:var(--font-serif)}
.wu-migrate-photo img{width:100%;border-radius:var(--radius);filter:saturate(.9)}

/* 5. 无缝切换深色 */
.wu-cutover-section{background:var(--dark)}
.wu-cutover-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.wu-cutover{
  background:var(--dark-soft);padding:28px 22px;border-left:3px solid var(--earth);
}
.wu-cutover h3{color:#EFE9DC;font-size:16.5px;margin-bottom:8px}
.wu-cutover p{color:#B9B1A2;font-size:13.2px;line-height:1.85}

/* 6. 周期表 */
.wu-cost-table{
  border:1px solid var(--line);background:var(--paper);
}
.wu-cost-row{
  display:grid;grid-template-columns:1fr 1.6fr 1fr 1fr;
  padding:18px 22px;border-bottom:1px solid var(--line);
  font-size:14px;align-items:center;
}
.wu-cost-row:last-child{border-bottom:none}
.wu-cost-row--head{
  background:var(--dark);color:#EDE7DA;font-weight:600;font-size:13px;
}
.wu-cost-row span:first-child{font-weight:600;color:var(--earth-deep)}
.wu-cost-note{
  margin-top:14px;font-size:12.5px;color:var(--ink-faint);line-height:1.8;
}
.wu-cost-note a{color:var(--earth-deep);border-bottom:1px solid var(--line)}

/* 7. 误区 */
.wu-mistake-section{background:var(--paper)}
.wu-mistake-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px;
}
.wu-mistake{
  background:var(--paper-deep);padding:28px 26px;
  border-left:3px solid var(--brown);
}
.wu-mistake h3{font-size:16.5px;margin-bottom:8px;color:var(--ink)}
.wu-mistake p{font-size:13.5px;color:var(--ink-soft);line-height:1.85}

/* 8. 相关 */
.wu-related-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.wu-related{
  background:var(--paper);border:1px solid var(--line);
  padding:26px 22px;transition:all .3s ease;
}
.wu-related:hover{transform:translateY(-4px);border-color:var(--earth)}
.wu-related h3{font-size:16.5px;margin-bottom:8px}
.wu-related p{font-size:13px;color:var(--ink-soft);line-height:1.8}

/* 9. CTA */
.wu-cta-section{
  background:
    linear-gradient(135deg, rgba(42,38,32,.93), rgba(58,53,44,.93)),
    url("../images/about-meeting.jpg") center/cover no-repeat;
  color:#EDE7DA;
}
.wu-cta-wrap{
  display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center;
}
.wu-cta-title{font-size:clamp(24px,3.2vw,36px);color:#EFE9DC;line-height:1.45;margin-bottom:14px}
.wu-cta-sub{font-size:14.5px;color:#C9C1B2;margin-bottom:24px}
.wu-cta-contacts{display:flex;gap:12px;flex-wrap:wrap}
.wu-cta-contact{
  display:inline-flex;align-items:center;gap:10px;
  background:rgba(255,255,255,.08);border:1px solid rgba(201,193,178,.25);
  padding:11px 16px;border-radius:var(--radius);
}
.wu-cta-contact:hover{background:var(--earth);border-color:var(--earth)}
.wu-cta-contact svg{width:16px;height:16px;fill:var(--earth-light)}
.wu-cta-contact:hover svg{fill:#fff}
.wu-cta-contact span{display:flex;flex-direction:column;font-size:13.5px;color:#EDE7DA}
.wu-cta-contact small{font-size:10.5px;color:#A49C8C;letter-spacing:.18em}
.wu-cta-btn{justify-self:end}

@media (max-width:991px){
  .wu-hero-inner,.wu-migrate-wrap,.wu-cta-wrap{grid-template-columns:1fr;gap:36px}
  .wu-when-grid,.wu-process{grid-template-columns:1fr 1fr}
  .wu-cutover-grid{grid-template-columns:1fr 1fr}
  .wu-related-grid{grid-template-columns:1fr 1fr}
  .wu-cta-btn{justify-self:stretch;text-align:center}
}
@media (max-width:640px){
  .wu-when-grid,.wu-process,.wu-cutover-grid,.wu-mistake-grid,.wu-related-grid{grid-template-columns:1fr}
}